LTC7801EUFD#TRPBF Integrated Circuits (ICs)

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LTC7801EUFD#TRPBF Application Field and Working Principle

The LTC7801EUFD#TRPBF is a direct current/direct current (DC/DC) switching controller designed for both synchronous and non-synchronous buck topology applications. This device is designed to convert a wide input supply voltage range in order to meet requirements of master/slave applications. This device is able to be powered from an ultra-low voltage power source, making it an ideal choice for applications with stringent system power consumption and cost constraints.

The LTC7801EUFD#TRPBF is a single output DC/DC controller that regulates the output voltage with a synchronous buck topology. It can regulate both continuous currents and short-term pulsed currents, delivering a maximum of 2.1A output current from a wide 4V to 18V input voltage range. Additionally, it features a voltage loop bandwidth of up to 3MHz for tight control of the output voltage switching.

The LTC7801EUFD#TRPBF is part of the PMIC (Power Management IC) family of products. PMICs provide a wide range of capabilities including powering, monitoring, and controlling electrical systems. Voltage regulators are a type of PMICs that convert one voltage to another and provide various output voltages. DC/DC switching controllers are a type of voltage regulator that uses switching techniques to convert one voltage to another.

Features

The LTC7801EUFD#TRPBF has a number of features that make it well-suited for a variety of applications.

• Programmable Slip Clamp: This feature allows the user to customize the voltage clamping limits to reduce output ripple.
• Watchdog Timer: This timer can be programmed to reset the output whenever the input voltage dips below a certain threshold.
• Power Good: This feature monitors the output and alerts the user when the output voltage is not within the set parameters.
• Overpower Protection: This feature prevents the power supply from overloading itself by shutting down the output if the current reaches a certain threshold.

Applications

The LTC7801EUFD#TRPBF is suitable for a variety of applications, including cryptographic systems, USB-C power adapter applications, and low-power consumer electronics. It is especially well-suited for applications that require a wide input voltage range and a high output current. Additionally, its synchronous buck topology and voltage loop bandwidth make it well-suited for applications that require tight control of the output voltage switching.

Working Principle

The LTC7801EUFD#TRPBF is a direct current/direct current (DC/DC) switching controller. This type of regulator works by converting a wide input supply voltage into a smaller output voltage that is regulated. These controllers are designed with built-in feedback control circuitry which monitors the output and makes adjustments closer to the correct voltage. In the LTC7801EUFD#TRPBF, this controller also provides a “slip clamp” feature which ensures that the output voltage stays within the desired range.

The LTC7801EUFD#TRPBF works by switching on and off a MOSFET transistor quickly enough to keep the output voltage within the desired range. When the MOSFET turns on, the input voltage is applied to the output node, which charges the output capacitor. When the MOSFET turns off, the voltage stored in the output capacitor is applied to the output node, providing a regulated output voltage. The regulator then monitors the output voltage and adjusts the MOSFET on and off times as needed to maintain the desired output voltage.

Conclusion

In conclusion, the LTC7801EUFD#TRPBF is a DC/DC switching controller that is well-suited for applications requiring a wide input voltage range and high output current. It features a voltage loop bandwidth of up to 3MHz for tight control of the output voltage switching and a number of other features such as a programmable slip clamp, watchdog timer, power good and overpower protection. This device is suitable for a variety of applications, including cryptographic systems, USB-C power adapter applications, and low-power consumer electronics.

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